Marine propeller.



N0. 637,6". Patented Nov. 2|, I899."

J. A. HOPEWELL.

MARINE PBOPELLER.

(Application filed June 24. 1899.]

(No Model.

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am 9 8 m V o N d e t n e t a P L L E W E P 0 H A MARINE PRUPELLER.

(Application filed June 24. 1899.]

2 Sheets-Sheet 2,

No Model.)

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i NiTEi) PATENT Erica.

JOHN ANDERSON HOPEWELL, OF ARNPRIOR, CANADA, ASSIGNOR OF ONE- THIRD TO WILLIAM BARCLAY CRAIG, OF SAME PLACE.

MARINE PROPELLER.

SPECIFICATION formingpart of Letters Patent no. 637,611, dated November 21, 189s.

' Application filed June 24, 1899. Serial No. 721,747. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN ANDERSON HOPE- WELL, of Arnprior, in the county of Renfrew, Province of Ontario, and Dominion of Canada, have invented certain new and useful Improvements in Marine Propellers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying draw- IO ings, forming a part hereof.-

My invention, which will be hereinafter fully set forth and claimed, relates to propellers for ships and boats.

The object of my invention is a propeller acting upon the water as nearv as may be diroot in the line of movement of the vessel and presenting on its return movement a reduced resistance-surface.

Figure 1 is an elevation of a boat fitted with my improved propeller. Fig. 2 is a top view of the propeller on a larger scale, with adjacent parts of hull and rudder, shown at the end of the rearward stroke of the rear float. Fig. 3 is a side elevation of the propeller with 2 5 the incasing parts removed. Fig. 4 is a longitudinal section of the propeller, shown at the half-stroke. Fig. 5 is an end view of the propeller, and Fig, 6 is a perspective view of the same. i

A, Figs. 1 and 2, is the hull of a vessel, at the stern of which a well 2 is formed to provide room for the forward part of the propeller by the transverse part a and the water-tight side boxings a, the latter affording 5 room for the coupling-rods and being open to the hold of the vessel. Two beams B are firmly bedded and secured a distance apart in the stern at one end, projecting rearward beyond the propeller. Their rear ends I) are bent down and in toward each other and joined (or formed in one piece) and connected to the stern-post B, to which the rudder B may be hung in the usual way. The boxings a are secured to the outer parts of the beams B.

Upon the beams B are journaled a pair of two-throw crank-axles C C, mounted in reverse order and each provided at its overhanging ends with crank arms C, set at a different angle to the main cranks, and the wrists of these are connected by coupling-rods D. Actuating motion is applied to the for ward crank-axle in any desired manner, one mode being shown in Figs. 2 and 4, in which the coupling-rods D are extended (D to a crank-arm e on the main crank-axle E, turned by the connecting-rod E of a steam-engine or other motor.

Each of the two-throw crank-axles C has one wide crank=space 3'i. e acomparatively long crank-pin c-and a narrowone 4, immediately adjoining, with a short pin 0, each being of course what is known as a double crank, and the cranks are set at an angle of one hundred and eighty degrees i. e., in a straight line opposite each other. As stated, the crank-axles are mounted in reverse order, so that on one the narrow crank 4 is on one side of the wide crank 3 and on the other axle on the other side; also, the wide cranks 3 point and move in opposite directions, while each pair of opposite cranks-i. e., a wide crank on the one axle and a narrow one on the other-move in unison.

Upon each long crank-pin c is j ournaled the upper end of a vertical frame F, ext-ending in width the full length of the pin 0, but swinging clear of the crank-arms and having its sides f connected by cross-braces f, Fig. 5, to stiffen it. The sides f are at their upper ends turned at a right angle or nearly so and continued horizontally or nearly so (f) toward the short crank-pin c of the other axle, and then one of them is bent over at a right angle to form a crossarm f, which is joined to the other or main arm, which is then continued in a straight line to and is journaled upon the short crank-pin c of the other crankaxle by a journalf To the lower side or cross-piece f of the frame F is pivotally hung a float 'G wide enough to fill the space between the frame sidesfand to swing clear of them. When turned up, as in Fig. 5, or when turned up from the other side, it will abut and rest 5 against the frame F. The space 5, formed between the crank-pin c and the cross-arm f" of the frame-armf', will be made long enough to allow the float G to swing clear of the arm I/ he angles of the vertical frame sides f and horizontal extensions f, and the angles Braces, gussets, or ribs f are formed in too formed by the cross-arm f" with the arms f are also made sufficiently strong to prevent undue warping of the frame.

The device operates as fellows: Motion being applied to the crank-arms O, transmitted by the coupling-rods D, the crank-axles Care put in rotary moti'on Assuming, for exam: ple, that this motion is in the direction of the arrows in Figs. 3 and 4: and starting from the position shown in Fig. 4:, the float G at the rear crank being elevated and abutting water in the opposite direction in which the boat is to move or is moving, having of course at the same time a gradual rising motion until the cranks reach a horizontal position. Thispressure must move the vessel forward. At the same time the main crank 3 of the forward crank-axle is being swung forward with its frame F, and the current of the water press ingagainst the float will open it and swing it rearward, the latter thus ofi'ering no resistance in its forwai'd passage through the water. When the downward motion of this crank commences, the float will be slightly lifted, forming an angle of less than ninety degrees with its frame, and as soon as the.

crank commences its rearward stroke the float will close and be fully lifted and abut with its free end against its frame, thus forming a solid resistance against the Water. Thus when-the position shown in Fig. 3 is reached. the forward float exerts its strongest action, while the rearward one is about to open and commence its return stroke.

The driving mechanism or mode of applying the motive power is capable of consider- One side or end of the i able modification. cranks only may be. driven, and in that case the coupling-rod on the other side may be dispensed with. Transmissiomgear may also be used, so that the: propeller-cranks; may make one revolution while the motor makes more than one revolution in order to obtain a long stroke of the propeller.

I claim as my invention--- 1. In a marine propeller, the combinationwit the hull of a vessel of a pair of beams having oneend, secured in the stern of the vessel a distance apart and extending rearwardly and united atytheir rear ends, a sternpost secured to the rear end of said beams, a water-tight casingat the outer side of each beamopen to the hold of the vessel, a pair of two-throw crank-axles journaled upon said beams and having their ends extending into,

said casings, crank-arms upon the overhanging ends of said crank-axles set. at an angle to the two-throw cranks, coupling-rods c.on-. meeting said. outside cranks, means of actuatingsaid crank-axles, each of the latter having a wide crank and a narrow one-set-atan angle of one-hundred andeighty degrees apart and the-two axles. mounted in reverse order to each ot-her so that a narrow'crank is opposite; awide crank adapting a narrow crank anda wide;

crank to rotate in unison, two frames each consisting of an arm j ournaled at one end upon a narrow crank and at the other branched out laterally near the wide crank and the branch arm continued parallel with the main arm and both journaled uponthe long crank-pin andthen turned downward and connected by cross-braces and at the lower end by a crossbar to form a vertical frame, and a float consisting ofa plate hung pivotally upon the lower cross-bar of said vertical frame to swing against the supportingframe F is being pushed with its full face direct against the clear up and down in any direction to a ver- 1 tieal position or nearly so, substantially as set forth.

2. In a marine propeller, the combination of a pair of beams having one end secured in the f stern of the vessel and extendingparallel rearward and having their-ends united and 5 secured to a stern-post, a pair of two-throw a crank-axles j ournaled transversely upon-said beams, each of said axles having a; wide anda 1 narrow crank at. an angle of one hundred, and f eighty degrees apart and mounted in reverse 1 order toeaoh, other so that the narrow crank of one moves in unison with the-wide crank of the other, an arm connecting each narrow j crank with the opposite wide crank said arm being branched out laterally near the wide icrank to form a frame journaledru'pon the 1' long crank -pin then continued vertically downward ad connected at the lower end,

and a float consisting of a plate hung pivot ally upon the lower cross-bar'of. said trans- 1' verse frame and adapted to swing up and down in. any direction and abut in its vertical'posi tion against, its supporting-frame, substantially as set forth. I

3;. A marine propeller consisting of a pair of two-threw crank-axles journaled at the stern of the vessel upon suitable'supports'trausversely to the center line of the vessel, each axle having-a wide crank and a narrowcrank adjacent to each other. and at an angle, of one hundred and eighty degrees apart. and said cranks mounted in reverse order to eachother, iavertical frame journaled at its upper end upon each'long crank-pin said frame having itssides turned at a right angle and extended in the direction of the other crank to form arms, one of said arms extended to the narrow crank-pin and the other arm turned and joined to the long crank-pin, a float consisting of a plate h-ung pivotally to the lower cross-bar of the vertical frame capable of; swinging freely up and down and abutting against the vertical frame; when raised, and means of giving arotary motion to the two crank-axles, substantially as set; forth.

r 4:. In amarine propeller, the combination with a pairof parallel supports placed a distance apart, of a pair of two-throw crank-axles 'j ournaled'u-pon said supp.orts,said crank-axles consisting of an arm having one end journaled upon one of the other narrow cranks and having near its other end a branch or cross arm turned and extended parallel to the main arm and both branches journaled upon the crankpin of a wide crank and then turned downward to form a vertical frame connected by cross-braces and by a cross-pin at the lower end and a plate acting as float hung pivotally to said cross-pin adapting it to swing freely 16 and when raised abut against the vertical supporting-frame, substantially as set forth. y

In testimony whereof I hereby afiix my sig nature in the presence of two witnesses.

JOHN ANDERSON HOPEWELL.

Witnesses:

B. HARVEY, M. PIoTRzKowsKY. 

